Accelerating the Hybrid Monte Carlo algorithm
A. Ali Khan, T. Bakeyev, M. Göckeler, R. Horsley, D. Pleiter, P. Rakow, A. Schäfer, G. Schierholz, H. Stüben
Abstract
An algorithm for separating the high- and low-frequency molecular dynamics modes in Hybrid Monte Carlo simulations of gauge theories with dynamical fermions is presented. The separation is based on splitting the pseudo-fermion action into two parts, as was initially proposed by Hasenbusch. We propose to introduce different evolution time-scales for each part. We test our proposal in realistic simulations of two-flavor O(a) improved Wilson fermions. A speed-up of more than a factor of three compared to the standard HMC algorithm is observed in a typical run.
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